How to Prevent Mold Growth in Humid Climates

It is true that mold can occur anywhere, but humid climates provide the optimal conditions for the fungi to grow and thrive:

The frequent precipitation and high air humidity typical of wet climates produce large amounts of moisture – the main prerequisite for mold growth;

The temperatures in humid climates are usually high throughout most of the year and contribute to the quick reproduction of mold spores.

Humid climates provide the perfect conditions for mold to thrive.

The excessive moisture combined with the right temperatures allows for extensive mold growth and causes great troubles – mold damage to personal property, health problems and allergic reactions triggered by mold exposure, etc. Getting rid of the mold is very difficult in wet climate areas, as the right conditions for its development remain present, and mold remediation is extremely laborious and time-consuming. The only good solution under these circumstances is to find an efficient way to prevent mold growth in the first place.

Mold prevention in humid climates, however, is quite the challenge. You need to take certain specific measures in order to thwart mold growth in such a moist environment.

How to Prevent Mold in Your Home

You can neither prevent mold spores from entering your home (they exist everywhere in the outdoor environment and can easily get inside through open doors and windows, air ducts and vents, or even attached to clothes, shoes, and bags), nor deprive mold of its “food” (the harmful microorganisms feed on organic materials, such as wood, carpet, paper, insulation, paint, plasterboard, fabrics, cotton, leather, furniture, and even dust that are found in abundance in the home). Your only option is to make sure the ambient conditions in your house are not right for mold to grow:

Ensure proper ventilation. Stale air provides perfect breeding and development conditions for the delicate mold spores – they can take roots, grow, and reproduce, completely undisturbed. To prevent such “untroubled development”, you need to allow plenty of fresh air inside and ensure good air circulation within your home – keep the windows open on sunny days, open doors between rooms, open drawers and closet doors, reduce clutter and move furniture away from walls to improve the airflow in your house, keep air ducts clean and in good condition, run exhaust fans in bathrooms and kitchens where steam and moisture can build up as a result of common everyday activities, etc. Make sure all areas of your house are properly ventilated and free of musty odors (especially confined and/or dark spaces);

Welcome fresh air in your home.

Take care of condensation. Mold thrives on surfaces with condensation, such as windows, metal pipes, and concrete walls. To reduce condensation in your home, you need to keep the indoor temperature higher and the relative humidity in the house lower. Installing appropriate insulation is the way to go here – have in mind though that in addition to ceilings, walls, and other structural elements of the home, it’s advisable to insulate the surfaces that are most prone to forming condensation as well. If you notice condensation, make sure you dry the surface immediately;

Use air conditioners and dehumidifiers to control your indoor climate and keep air humidity low (see below for more details on how to control humidity in home);

Use mold-resistant products and materials in your home. When living in a humid climate, it’s advisable to equip your home with mold-resistant materials – plastic, metal or glass household items and surfaces (instead of wooden ones), tile or laminate floors (instead of carpeted ones), moisture-resistant drywall in which the gypsum core is covered in fiberglass so that the surface becomes impervious to water (instead of traditional drywall in which the core is pressed between plies of paper), paint that contains mildewcides (chemicals that effectively inhibit mold growth), etc.;

Clean, dust, and disinfect household surfaces. Frequent cleaning helps remove the mold spores from household surfaces and considerably reduces the dirt and grime (excellent sources of organic food for the harmful fungi) in the home. Therefore, you are strongly recommended to wash and disinfect plastic, metal, glass, stone, tile and other hard surfaces in your home on a regular basis and dry them well immediately after cleaning. Also, make sure you dust and vacuum often (preferably with a vacuum cleaner equipped with a HEPA filter) to prevent the accumulation of dust and dirt on your furniture, carpets, draperies, etc. It has been found that about 80% of household mold grows on dust. Consider having the carpets and upholstery in your home professionally cleaned once or twice a year;

Inspect your property at regular intervals and immediately after violent storms, torrential rains, snow meltdown, etc. to detect eventual mold growth in its early stages and prevent it from spreading further into your home;

Condensation forms as water vapor from the air cools and liquefies when it comes in contact with cold surfaces.

However practical and adequate these measures may be though, they will not have a substantial effect if there is enough moisture in your home to allow mold growth. The only way to efficiently prevent mold in the house is to control the humidity in the indoor environment.

How to Control Humidity

Humidity control seems easy to achieve with the help of highly advanced technology – we can use AC units, dehumidifiers, and various other hi-tech devices that have been specifically designed to control indoor climate and maintain optimal temperatures and humidity levels within the home. Controlling humidity in wet climates, however, poses a number of specific challenges – you can’t just open the windows to improve airflow in the home, for example (when outside humidity levels are high, letting outdoor air into your house will increase the indoor humidity).

So, how can you control moisture and prevent mold growth in humid climates?

1) Ensure proper air conditioning:

Use quality AC units properly sized for your house. If your air-conditioning unit is too small, it will run constantly without achieving the desired effect; if it is too big, it will start and stop frequently which will make it difficult to maintain constant temperature and humidity levels;

Set your air conditioner to about 70 degrees Fahrenheit during the hot summer months and keep your home warm in cool weather;

Set the AC fan mode to “auto”, not to “on”. When the fan is set to “on”, it runs continuously and does not allow enough time for the moisture that condenses onto the evaporator coil during the cooling cycle to drain off – it is re-evaporated and blown back into the house, increasing the humidity level;

Proper air conditioning can help you control the humidity in your home.

Close windows and doors when your AC unit is running. If the doors and windows are open, warm, humid outdoor air will enter your cooler home and cause condensation;

Maintain your air conditioner in excellent condition to make sure it works effectively. Clean and replace the filters every month during the summer, inspect the condensate drain pipe to make sure it’s dripping regularly (otherwise water may be accumulating inside the unit or on the floor), call a service professional at least once a year for more complex maintenance, such as cleaning the coils, etc.

2) Use dehumidifiers to keep the humidity level in your home below 50%.

3) Do not let wet items stay inside:

Dry washed clothes outside or use a clothes dryer (never hang clothes to dry inside). Make sure they are completely dry before putting them away in drawers and closets;

Do not leave wet towels or other wet items lying around in your home;

Take wet shoes off at the door and clean pets’ paws after walks to prevent water and mud from being tracked into your house;

Thoroughly dry your items before storing them inside, especially if they won’t be used for prolonged periods of time;

Add some Taheebo tea or other appropriate anti-mold products to the water you give to your indoor plants to hinder mold growth in plant soil (moist soil is an ideal breeding ground for mold);

Remove standing water (such as puddles around sump pumps or hot water tanks) and dry wet areas within your home as soon as possible;

Leak-proof doors and windows to prevent water seepage into your home during storms and torrential rains.

Controlling humidity in your home may not be very easy but it will help prevent mold growth and any ensuing mold problems – mold allergies, mold damage to your property, expensive and time-consuming mold remediation, etc. Your efforts will be rewarded with a healthy, mold-free living environment. It’s worth it.

Expert in emergency fire and water restoration services, fire cleanup and water damage cleanup, mold removal, as well as carpet and upholstery cleaning services. Contributor to several restoration and cleaning blogs.